Surface and Tip-Enhanced Raman Spectroscopy at the Plasmonic Hot
Spot of a Coordination Complex-Conjugated Gold Nanoparticle Dimer
Anushree Dutta
Arun Chattopadhyay
10.1021/acs.jpcc.7b07301.s001
https://acs.figshare.com/articles/journal_contribution/Surface_and_Tip-Enhanced_Raman_Spectroscopy_at_the_Plasmonic_Hot_Spot_of_a_Coordination_Complex-Conjugated_Gold_Nanoparticle_Dimer/5319505
We report a synthetic
method to generate surface enhanced Raman scattering (SERS) active
gold nanodimer, by employing rationally designed co-ordination complex
of europium (Eu) metal with 4-mercaptobenzoic acid (4-MBA) and heterocyclic
phenanthroline ligands. The reaction between the Raman active 4-MBA
ligand of the Eu-complex and citrate-stabilized Au nanoparticles (cit-Au
NPs) led to selective dimerization in considerable yield and precise
control over hot-spot engineering to maximize SERS. Additionally,
scanning probe microscopy (SPM)-correlated tip-induced Raman enhancement
using He–Ne laser focusing on the plasmonically coupled Au
nanodimers helped obtain intense Raman signal at the spatial resolution
of single dimer. The average SERS amplification was measured to be
on the order of 10<sup>9</sup>, whereas that in the presence of tip-enhancement
was found to be 10<sup>4</sup>. This extraordinary Raman activity
of an inorganic complex-coupled gold nanodimer therefore augurs well
for applying chemical synthetic strategies in designing plasmonically
active assembled nanomaterials for applications in photovoltaics,
photocatalysis, biosensing, and single molecule spectroscopy.
2017-08-01 00:00:00
molecule spectroscopy
SPM
hot-spot engineering
complex-coupled gold nanodimer
4- MBA ligand
SERS amplification
heterocyclic phenanthroline ligands
10 9
10 4
gold nanodimer
Plasmonic Hot Spot
scanning probe microscopy
Coordination Complex-Conjugated Gold Nanoparticle Dimer
Raman signal
cit-Au NPs
Tip-Enhanced Raman Spectroscopy
Raman activity